Adjustable concrete-form.



l. P. HALGREN.

ADJUSTABLE CONCRETE FORM. APPLICATION 'man APR. u. 1916'.

Patented 212m.' 16,1917.

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TED srATEs ATENT OFFICE.

JOHN IP. HALGREN, OF KANSAS CITY, MISSOURI.

ADJUSTABLE CONCRETE-FORM.

Specification of Letters Patent.

Application led April 17, 1916. Serial No. 91,594.

To all whom t may concern:

Be it known that I, JOHN P. HALGREN, a citizen of theY Kansas City, inthe county kof Jackson and State of Missouri, have invented certain newand useful Improvements in Adjustable Concrete-Forms, of which thefollowing is a full and exact specification.

This invention relates to improvements inv forms or molding devicesdesigned for use 1n the construction of concrete walls, such as wallsfor silo bins, tanks, and like structures.

The primary object 1n view 1s to devise a simple, durable andconveniently operatedv design of form of a character adapted to be usedin building such walls-in step by step fashion, the form beingintermittently elevated in the course of the walls construction. l

It vis afurther object to produce a type of form especially adapted forthe construction of bins and a@ like and Which-Win permit convenientvariation of the diameter of the form'within'suitable limits accordingto 'the size of bin desired. It is also sought to sim- Y plifyand'improve'generallythe type of apparatus'whereby this particularcharacter of concrete construction is carried out.

Having these general objectsin view the invention will now be describedwith referf. ence to the accompanying drawing illustrating one form ofconstruction which has been devised for embodying the improvementsinpractice, after which those particular features deemed to be novel willbe set forth and defined -in the appended claims.

i IV-IV, respectively,

- trating the In the drawing-Figure 1 is a side elevation of a formconstructed in accordance with the present improvements; Fig. 2 is aplan view of a portion of the form; Figs. 3 and 4 are sections on thelines III-III and of Fig. 2, being taken 5 is an enlarged pertheband-supporting a plan view, on a reof the molding walls and illusboltopenings whereby the upright members are adjusted to different positionscircumferentially of said walls.

eferring lin detail to thefdrawing, the apparatus isjillustrated ascomprising a pair on a larger scale; Fig. spective view of one ofmembers; and Fig. 6 is duced scale,

United States, residing at of molding walls, 2, 2, arranged in spacedrelation and provided with a series of channel upright members 4, spacedat equal intervals around the form. The molding walls 2 are constructedof any suitable flexible material, such as sheet metal of appropriategage, thus permitting the same to assume the cylindrical-formillustrated, and allowing the ends thereof to be overlapped more oryless in varying the size of the form yfor molding bins of differentdiameters. For this purpose the ends of the molding walls 2 are providedwith the series of bolt openings 6, spaced apart the required distanceto give the desired variation in diameter, and bolts 8 being used tosecure the ends of each molding wall together.

The channel upright members 4 Vare arranged in pairs and secured bybolts 9 to the inner and outer faces of the molding walls, said boltspassing through openings 10 in said walls, these. openings 10 in eachset being arranged the proper distance apart for permitting the uprightsto be spaced at equal intervalsV around the form when the latter isexpanded or contracted to different diameters; c'. e., the distancebetween the openings of each set gradually varies, being greater betweenthe openings at the ends of the mold walls 2 than between the openingsof the intermediate sets, as illustrated in Fig. 6, since theintermediate uprights require less adjustment of position than theremaining uprights for maintaining their equidistant relation. Eachupright member 4 also carries by means of the bolts 9 a pair of slightlycurved channel pieces 12, the passages through which are of lT-sha'pe incrossprovided with a series ef bolt openings 22 for the bolts .24 forthe rib portions 18 by pouring the concrete rights 4, and thechannelpassage through the members 12 is of suincient diameter ('seeFig` 4) to provide the requisite clearance for j permitting suchrelative lateral play of the ends of the sections 14 as will occur inmalg-- ing this adjustment for slightly varying diameters of the form.

The upright members 4 project above the upper margins of the moldingwalls 2, where they are provided with the bolts 28 and' channel pieces30 or equivalent spacing constructiomand for attachment of such jack'-ing mechanism as may be used for raising and lowering the form as`operated. Any suitable cross-bracing for the interior` of the form maybe provided for large diameters; but neither this interior bracing northe jacking mechanism are illustrated, since the same form no part ofthe present invention.

The manner of adjusting the form and the mode of use of the same will beapparent from the foregoing. In changing the form to a slightlydifferent diameter, the sections 14 at the over-lapping ends of thewalls 2 are unbolted at one end and the bolts 8 shifted to the properopenings 6 to give the required diameter of form; the uprights 4'4 beingof course also shiftedto the proper bolt openings 10 to equalize theintervals between said uprights, and necessitating a correspondingadjustment telescopically of the ends of the various band sectionswithin the band supporting pieces 12. Having adjusted the parts to thedesired diameter of form, the molding operation is carried on betweenthe mold walls 2, the form being gradually elevated by any approved typeof jacking means step bystep, as the concrete construction is built up."f

It will thus be apparent that a' simple, strong and rigid formconstruction isoprovided for carrying out the desired objects of` theinvention, andV that the same may be readily and conveniently assembledand adjusted Within the limits provided for, and

A iications as may fairly fall within the scope whilethe foregoingrepresents what is now deemed to constitute the preferred form ofembodiment ofthe improvements, the right is reserved to such formalchanges and modiof the appended claims.

1. In a concrete form construction, the combination of a pair of spacedmolding walls adapted to be expanded or contracted to various diameters,a series of uprights adjustable horizontally along the inner. and outer`faces of said walls and provided with means forsecu'ring said uprightsthereto in diderent horizontal positions for diderent diameters offorms, and band members arranged in circumferentially adjustablesections conforming to said inner and outer faces and secured to saiduprights. 2,. Ina concretewform construction, the combination of a p'airof spaced molding walls of flexible material adapted to be expanded orcontracted to various diameters of form, a series of uprights providedwith means for securing the same to' said mold mg along the latter, bandmembers arranged 1n sections conforming to the inner and *outer facesvofV said molding walls and adjustable circumferentially with referenceto said walls, and means for adjustably securing said band sections to'said uprights.

3. In a concrete combination of a pair of spaced molding walls, a seriesof uprights adjustable horizontally along the inner and outer faces ofsaid walls, band members arranged in sections extending between saiduprights and conforming to said inner and outer faces, and bandsupporting members carried` by said uprights and having adjustableconnection with the adjoining ends of said band sections. j

4. In a concrete form construction, the combinationrof a pair of spacedmolding walls' adapted to be expanded or contracted to differentdiameters, a` series of uprights provided with connections for securingthe same tothe inner and outer faces of said walls and at differentpoints circumferentially thereof, band members arranged in sectionsextending .between said uprights and conforming to said inner and outerfaces, and bandv supporting members carried by said uprights and havingadjustable telescopic connection with the adjoining ends of said bandsections. n j o 5; In a concrete form construction, the combination of apair of spaced molding walls adapted to be expanded or contracted todifferent diameters of form, a series of uprightsprovided withconnections for securing the same to the inner youter faces of saidwalls and at different points circumferentially thereof, band members ofshaped cross-section arranged in sections extending between saiduprights and conforming to said inner and outer faces, and bandsupporting channel members carried by said uprights and formed toslidingly receive the adjoining ends of said band sections and proidedVwith adjustable connections therewit 6. In a concrete form construction,the

form construction, the

combination `of a pair of spaced molding of said Walls and at differentpoints circumferentially thereof, band members arranged in sectionsextending between said uprights and conforming to said inner and outerfaces, and band supporting channel members carried by said uprights andhaving adjust# able telescoping connection With the adjoining ends ofsaid band sections, said channel members being formed to permit slightrelative lateral movement of the ends of Said 10 sections as theuprights are shifted to different positions.

JOHN P. HALGREN.

Copies of this patent may be obtained for ve cents each, by addressingthe Commissioner of Patents, Washington, D. C.

